Research Of Blasting Vibration Based On The Method Of Acceleration Power Spectrum Density

The blasting vibration can not only interfered people's daily work and life, but also affect the building facilities and precision equipment which is sensitive to the vibration. Precision instruments are very demanding on the usage environment. If only used the maximum speed or maximum acceleration as control index, it may be difficult to achieve the standard of the accuracy. Therefore, the acceleration power spectral density method is proposed to control blasting. In this paper, use the Dalian Intel group field leveling blasting construction as the background, based on the harsh acceleration power spectral density control standards which was put forward by the United States, the construction scheme of blasting vibration in the presence of precision equipment is designed, and the corresponding analysis and research are carried out.At present at home and abroad has not yet introduced acceleration power spectrum density control problem, so under no ready-made experience can refer to, from a technical point of view analysis of blasting, itself is a "can" and "no". Secondly if use the blasting method, whether the blasting method can be optimized under the premise of considering the cost of the project, such as use the deep-hole blasting and other problems, decided to take field experiment to determine the blasting method for the engineering feasibility, and the optimized blasting scheme if it is feasible.In the design scheme, choose the local blasting cases, to calculate the different speed and frequency of blasting vibration acceleration power spectral density, compared with the control standard of the United States, the control index of blasting vibration is obtained. And then design the blasting construction scheme:use the Ms-6, Ms-7, Ms-8 sections of the nonel tube detonators in the holes, and Ms-4, Ms-5 sections of the nonel tube detonators on the surface, and adhere to the principle of the reduction of the amplitude and increase frequency of blasting; the method of combining deep-hole and short-hole is chosen to control the vibration, and the control standard of blasting vibration velocity is 0.05cm/s.For the analysis of velocity, acceleration and displacement attenuation law, the Sodev's formula is used to fit the curve. From the fitting curve analysis can be found all of them can quasi synthetic attenuation curve of Sodev's formula. The fitting curve of acceleration data is higher than that of the other two, and the effect of deep-hole blasting is better than that of short-hole blasting. For the analysis of the frequency attenuation rule, the frequency decay formula deduced by Zhang Liguo and attenuation of average frequency attenuation proposed by Lu Wenbo was used to analysis the data. The results show that the frequency of attenuation change is very complex, a lot of external factors can affect it, and may even cause sudden increase phenomenon, so it is very difficult to control blasting with frequency attenuation in operation.The acceleration power spectrum density method is used to control the blasting vibration, which not only considers the acceleration and frequency of blasting parameters, but also has the specific control of the control standard proposed by Intel. For the acceleration power spectral density atlas analysis of deep-hole and short-hole blasting can be found, no matter what kind of blasting, it is feasible to use the current initiation network and the form of engineering design for blasting construction when the 0.02cm/s is used as the vibration control standard at plant edge. According to the velocity standard, the blasting area is divided. Design blasting construction scheme which can not only protect the safety of precision equipment, but also save the cost of the project.